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Physicochemical properties of Pyr13TFSI-NaTFSI electrolyte for sodium batteries

TitoloPhysicochemical properties of Pyr13TFSI-NaTFSI electrolyte for sodium batteries
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2022
AutoriStigliano, P., Ferrara C., Pianta N., Gentile A., Mezzomo L., Lorenzi R., Berbenni V., Ruffo R., Appetecchi Giovanni Battista, and Mustarelli P.
RivistaElectrochimica Acta
Parole chiaveBis(trifluoromethane sulfonyl)imide, Concentration ranges, Electrolytes, Ionic liquids, Lithium, Lithium batteries, Manganese compounds, Molefraction, N-propyl, Na+ ions, Negative ions, Nuclear magnetic resonance spectroscopy, Physicochemical properties, Physicochemical property, Sodium, Sodium battery, Sodium compounds, Sodium salt, Solid state NMR, Transport

{Ionic liquids (ILs) are an increasingly important component of electrolytes for lithium and sodium batteries. Here, the physicochemical properties of the system N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr13TFSI) ionic liquid and NaTFSI are investigated vs. the concentration of the sodium salt and the temperature. The explored concentration range was (1-x) Pyr13TFSI: x NaTFSI with x (mole fraction) = 0, 0.02, 0.05, 0.1, 0.2. 23Na solid-state NMR reveals that the Na+ ions exist in two distinct environments: mobile Na+ ions (1), and Na+ ions involved in clusters or even bigger interacting networks (2). The ratio between mobile and bonded Na+ populations increases with temperature and decreases with increasing salt concentration, reaching 100% at 60 °C for the most diluted compositions. Raman spectroscopy allows to identify the quantity of free and bonded anions depending on the concentration, and to measure the number of Na+ ions solvating the TFSI− anion (SN = 4). The combined NMR and Raman results allow us to estimate the salt solubility range


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Citation KeyStigliano2022